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Condensed Matter > Mesoscale and Nanoscale Physics

Title: Intrinsic spin-orbit torque in an antiferromagnet with weakly noncollinear spin configuration

Abstract: An antiferromagnet is a promising material for spin-orbit torque generation. Earlier studies of the spin-orbit torque in an antiferromagnet are limited to collinear spin configurations. We calculate the spin-orbit torque in an antiferromagnet whose spin ordering is weakly noncollinear. Such noncollinearity may be induced spontaneously during the magnetization dynamics even when the equilibrium spin configuration is perfectly collinear. It is shown that deviation from perfect collinearity can modify properties of the spin-orbit torque since noncollinearity generates extra Berry phase contributions to the spin-orbit torque, which are forbidden for collinear spin configurations. In sufficiently clean antiferromagnets, this modification can be significant. We estimate this effect to be of relevance for fast antiferromagnetic domain wall motion.
Comments: 8 pages, 6 figures
Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Cite as: arXiv:1803.06428 [cond-mat.mes-hall]
  (or arXiv:1803.06428v1 [cond-mat.mes-hall] for this version)

Submission history

From: Suik Cheon [view email]
[v1] Fri, 16 Mar 2018 23:49:14 GMT (1177kb)